content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * -------------------------------
   * StatisticalCategoryDataset.java
   * -------------------------------
   * (C) Copyright 2002-2009, by Pascal Collet and Contributors.
   *
   * Original Author:  Pascal Collet;
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * Changes
   * -------
   * 21-Aug-2002 : Version 1, contributed by Pascal Collet (DG);
   * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   * 24-Oct-2002 : Amendments in line with changes to the CategoryDataset
   *               interface (DG);
   * ------------- JFREECHART 1.0.x ---------------------------------------------
   * 02-Feb-2007 : Removed author tags from all over JFreeChart sources (DG);
   *
   */
  
  package org.jfree.data.statistics;
  
  import org.jfree.data.category.CategoryDataset;
  
  /**
   * A category dataset that defines a mean and standard deviation value for
   * each item.
   */
  public interface StatisticalCategoryDataset extends CategoryDataset {
  
      /**
       * Returns the mean value for an item.
       *
       * @param row  the row index (zero-based).
       * @param column  the column index (zero-based).
       *
       * @return The mean value (possibly <code>null</code>).
       */
      public Number getMeanValue(int row, int column);
  
      /**
       * Returns the mean value for an item.
       *
       * @param rowKey  the row key.
       * @param columnKey  the columnKey.
       *
       * @return The mean value (possibly <code>null</code>).
       */
      public Number getMeanValue(Comparable rowKey, Comparable columnKey);
  
      /**
       * Returns the standard deviation value for an item.
       *
       * @param row  the row index (zero-based).
       * @param column  the column index (zero-based).
       *
       * @return The standard deviation (possibly <code>null</code>).
       */
      public Number getStdDevValue(int row, int column);
  
      /**
       * Returns the standard deviation value for an item.
       *
       * @param rowKey  the row key.
       * @param columnKey  the columnKey.
       *
       * @return The standard deviation (possibly <code>null</code>).
       */
      public Number getStdDevValue(Comparable rowKey, Comparable columnKey);
  
  }
  
  